Re: Day Pack or Fanny Pack?
I use a daypack. I carry essentials that are always in it, and add other things depending on the hunt.
Small First aid kit
Space Blanket (can be used as tarp, a dry place to sit, or as intended for warmth)
Zip-loc bag with TP (you never know when nature will call)
Stormproof matches in waterproof case
Small Disposable poncho
Petrified Power Bar (emergency rations)
Options (depending on hunt, time of year etc.)
Waterproof Jacket, Pants
Extra Knife and Steel
Small Gerber Hatchet
Ammo, Speed Loaders etc
Spotting scope and tripod
As I have had to spend nights out away from camp, and with temperature variances, a backpack allows me to carry the stuff needed to get by and holds clothes as you shed and add layers.
I did not forget binoculars, but they are rarely in the pack and usually on my chest.